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From: Blue Swirl <blauwirbel@gmail.com>
Date: Tue, 27 Sep 2011 16:39:42 +0000
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Subject: Re: [Qemu-devel] [FYI] Soft feature freeze for 1.0 is 10/15 (three
 weeks away)
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To: Avi Kivity <avi@redhat.com>
Cc: qemu-devel <qemu-devel@nongnu.org>

On Tue, Sep 27, 2011 at 8:57 AM, Avi Kivity <avi@redhat.com> wrote:
> On 09/27/2011 11:33 AM, Avi Kivity wrote:
>>
>> On 09/26/2011 09:07 PM, Blue Swirl wrote:
>>>
>>> >> =C2=A0The default address is used for early serial printk in OpenBIO=
S, so
>>> >> it
>>> >> =C2=A0should still work.
>>> >
>>> > =C2=A0Ok, so drop the extra mapping, but init the dynamic mapping to
>>> > 0x80013000.
>>>
>>> That should work.
>>
>> It's already there (macio.c):
>>
>> =C2=A0 =C2=A0if (macio_state->escc_mem) {
>> =C2=A0 =C2=A0 =C2=A0 =C2=A0memory_region_add_subregion(bar, 0x13000, mac=
io_state->escc_mem);
>> =C2=A0 =C2=A0}
>>
>> I'll drop the extra mapping.
>>
>
> Well, it's not that easy. =C2=A0As the other mapping is part of an ordina=
ry BAR,
> you need to setup the device (at least PCI_COMMAND and PCI_BASE_ADDRESS_0=
)
> so it responds to memory requests, and also enable the bridge.
>
> We could hack it by having a low-priority mapping at 0x80013000, but it
> seems wrong. =C2=A0Maybe the firmware should configure that BAR first? =
=C2=A0What
> happens on real hardware?

In this message I seem to confess that the address is arbitrary and in
the subsequent messages the overlap with PCI region is also discussed.
http://lists.nongnu.org/archive/html/qemu-devel/2009-01/msg00542.html

Maybe the address of macio should be fixed as Laurent suggested.